Method of and apparatus for finishing paper



May 11 1926. 1,583,788

A. G. GILMAN METHOD OF AND APPARATUS FOR FINISHING PAPER Filed Oct. 20,,1924 2 Sheets-Sheet l- /170 0 M fag Nae/zine Co a/ing Mac/vine ATTORNEYS INVENTOR BY A exander 6. Gilman v azwmw May 11 1926.

v A. GILMAN METHOD OF AND APPARATUS FOR FINISHING PAPER Filed OCt. go,1924 2 Sheets-Sheet 2 '7 11v VENZOR Alexander 6. 61 man A TTORNE V5Patented May 11, 1926.

UNITED STATES 1,583,788 PATENT- OFFICE.

ALEXANDER Quinlan, or KALAMAZOO, MICHIGAN.

mrrnon or AND APPARATUS For. FINISHING PAPER.

Application filed October 20, 1924. Serial No. 744,737.

This invention relates to improvements in a method and apparatus forfinishing paper.

The main object of this invention is to provide an improved method offinishing coated paper whereby a uniformly smooth even surface andtexture is secured.

A further object is to provide a method of' finishing paper by which theabove results may be secured with a minimum of coating.

paratus for finishing coated paper securing the above results which isof large capacity A structure which is a preferred embodi-.

ment of my inventionis clearly illustrated in the accompanying drawing,forming a part of this application, in which:

Fig. I is a diagrammatic view of an apparatus for finishing paper by myimproved method.

Fig. II is a fragmentary erspective view of one of the units employed inthe finishing of paper by my improved method.

In the drawing similar reference charac ters refer to similar partsthroughout the sev ral views.

eferring to the drawing, I have diagrammatically illustrated in Fig. Ithe units employed by me in the complete finishing of paper by myimproved method. This consists of a coating machine designated generallyby the numeral 1, the particular-machine illustrated being designed toapply a coating to one side only of the paper. From the coating machinethe paper is passed to a drier, indicated generally by the numeral 2,this drier being of the loop type .and also being shown conventionally.The passage of the paper through the drier is designed so that when thepaper is delivered therefrom, the coating approximates but has notreached the setting point.

From 'the drier the paper is passed through a smoothing machine whichconsists of a supporting cylinder 3, a p-lurallty of "guide rollers 4and 5 ,and polishing or smoothing brushes 6 which are disposed to Astill further object is to provide an ap-.

coact'upon the web of paper 7 while it is supported by the cylinder 3. l

The brushes 6 act upon the coated surface of the paper, brushing andsmoothing the partially dried coating and forcing the'same into .theporesof the paper. These brushes are of fine material, that is, theyhave relatively fine filaments, the filaments being thickly setand'forming quite a firm compact body. In practice, the brushes 6 aredriven at a relatively highrate of speed so that as the paper passesover the cylinder the coating is subjected to a verysubstantial brushingand smoothing action. The coating, however, is sufliciently dried whilesubjected to this action so that no material amount is removed by thistreatment.

From the polishing or smoothing machine, the paper is,passed to a roll8, or to a calendering machine indicated conventionally at 9, thecalenderingniav chine being employed when it is desired to provide thepaper with'a high polish. A satisfactory coating is that'commonlydesignated as enamel coating, commonly consisting of china clay, caseinand satin White, the proportions being varied according to the gradeofenamel. The satin wliite is entirely omitted in certain low gradeenamels, the percentage increasing in the 'higher grades as will bereadily understood by those skilled in this. paper eating art.

By my improved finishing method, I am I enabled to produce a uniformfinish of a.

very fine smooth character and this may be accomplished with a minimumof coating.

While the units employed by me in practicing my' improved method offinishing paper are mainly shown in conventional form, it" is believedthedisclosuremade will enable those skilled in the art to which myinvention relates to embody or carry out my invention as may be. bestsuited or most practical for the particular mill or installation.

Having thus described my invention, what I claim as new and desire tosecure by L tters Patent, is:

' 1. "The method of finishing paper consisting of coatingwith an enamelcoating, passing through a drier. to dry to approximately the settingoint of the coating, subjecting. while in suc condition of dryness tothe'ac- 'tion of a rotating brush, and calendering.

2. The method of finishing paper consisting of coating with an enamelcoating, passa supporting cylinder for thepaper while I ing through adrier, subjecting while in acted upon by said brush, and a calendar 1approximately dry condition to a brushing acting upon the papersuccessively in the action, and calendering. order named. 4

3. An apparatus for finishing paper com- In witness whereof I havehereunto set prising a coating applying means, a drier, my hand. arotating brush driven at high speed and v having thickly set relativelyfine filaments, ALEXANDER G. GILMAN.

